Age of planation surfaces: correlation of the¢ Northern and Southern hemispheres continents

Abstract

Platform areas of each continent show series of planation surfaces equal in number and in the age. The similarity can be attributed to the f act of general isostatic equilibrium of the continents; planation surf aces are formed due to changes of ocean level. Each surface corresponds to epoch of a global transgression: the Late Jurassic -- Early Cretaceous surface developed during the «Great Cretaceous transgression» when the ocean level was 300 to 350 m above the present one, the Eocene - Oligocene, Miocene and Pliocene surfaces correspond to smaller transgressions.